命令帮助篇man和info

时间 2020-07-11

标签命令帮助 man info 繁體版

原文原文链接

本文出自做者学习鸟哥linux私房菜的学习笔记html

若有雷同毫不是巧合linux

一 mangit

linux里边有句俗语叫作有问题找男人，这个男人就是man （manual）redis

man 命令名称就能获得详细的命令的相关解释shell

（1）eg：man dateless

DATE(1) User Commands DATE(1)ide

#请注意上边这个括号内的数字函数

NAME <==这个命令的完整全名，以下所示为date且说明简单用途为设置与显示日期/时间工具

date - print or set the system date and time学习

SYNOPSIS <==这个命令的基本语法以下所示

date [OPTION]... [+FORMAT]

date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]

DESCRIPTION <==详细说明刚才语法谈到的参数的用法

Display the current time in the given FORMAT, or set the system date.

-d, --date=STRING

display time described by STRING, not ‘now’

-f, --file=DATEFILE

like --date once for each line of DATEFILE

#………………中间省略若干字

#下面就是格式化输出的详细数据

FORMAT controls the output. The only valid option for the second form

specifies Coordinated Universal Time. Interpreted sequences are:

%% a literal %

%a locale’s abbreviated weekday name (e.g., Sun)

%A locale’s full weekday name (e.g., Sunday)

%b locale’s abbreviated month name (e.g., Jan)

%B locale’s full month name (e.g., January)

%c locale’s date and time (e.g., Thu Mar 3 23:05:25 2005)

%C century; like %Y, except omit last two digits (e.g., 21)

%d day of month (e.g, 01)

%D date; same as %m/%d/%y

%e day of month, space padded; same as %_d

%F full date; same as %Y-%m-%d

%g last two digits of year of ISO week number (see %G)

%G year of ISO week number (see %V); normally useful only with %V

%h same as %b

%H hour (00..23)

%I hour (01..12)

%j day of year (001..366)

%k hour ( 0..23)

%l hour ( 1..12)

%m month (01..12)

%M minute (00..59)

%n a newline

%N nanoseconds (000000000..999999999)

%p locale’s equivalent of either AM or PM; blank if not known

%P like %p, but lower case

%r locale’s 12-hour clock time (e.g., 11:11:04 PM)

%R 24-hour hour and minute; same as %H:%M

%s seconds since 1970-01-01 00:00:00 UTC

%S second (00..60)

%t a tab

%T time; same as %H:%M:%S

%u day of week (1..7); 1 is Monday

%U week number of year, with Sunday as first day of week (00..53)

%V ISO week number, with Monday as first day of week (01..53)

%w day of week (0..6); 0 is Sunday

%W week number of year, with Monday as first day of week (00..53)

%x locale’s date representation (e.g., 12/31/99)

%X locale’s time representation (e.g., 23:13:48)

%y last two digits of year (00..99)

%Y year

%z +hhmm numeric timezone (e.g., -0400)

%:z +hh:mm numeric timezone (e.g., -04:00)

%::z +hh:mm:ss numeric time zone (e.g., -04:00:00)

%:::z numeric time zone with : to necessary precision (e.g., -04,

+05:30)

%Z alphabetic time zone abbreviation (e.g., EDT)

ENVIRONMENT <==与这个命令相关的环境参数有以下说明

TZ Specifies the timezone, unless overridden by command line param-

eters. If neither is specified, the setting from /etc/localtime

is used.

AUTHOR <==这个命令的做者

Written by David MacKenzie.

REPORTING BUGS <==有问题请致信下面的邮箱

Report bugs to <bug-coreutils@gnu.org>.

This is free software. You may redistribute copies of it under the

terms of the GNU General Public License

<http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the

extent permitted by law.

SEE ALSO <==这个重要，你还能够从哪里查到与date相关的说明文件之意

The full documentation for date is maintained as a Texinfo manual. If

the info and date programs are properly installed at your site, the

command

info date

should give you access to the complete manual.

date 5.97 March 2011 DATE(1)

（二）man文件主要是看description部分

进入man的操做页面后的一些操做

：后输入

/string 向下查询字符串

？string 向上查询字符串

n/N 使用/ ?是 n查询下一个，N查询上一个

空格向下翻页 q退出

（三）date(数字)

数字的含义1~9

其中1,5,8比较重要

1，用户shell环境中能够操做的命令或执行文件

2，系统内核可调用的函数与工具等

3，一些经常使用的函数和函数库

4，设备文件说明，一般在/dev下的文件

5，配置文件或者是某些文件的格式

6，游戏

7.惯例与协议

8，系统管理员可用的管理命令

9，跟kernel有关的文件

用man 1（1~7） man 方式来取得更详细的说明

（四）man -f man取得man命令的说明文件

man -k man 利用关键字将说明文件里面含有man的字相关的取出来

whatis 至关于man -f

apropos 至关于man -k

二 info